Realistic territorial changes if America won the war of 1812.

You're talking about a patch of dry, unpopulated prairie land in terms of what is being offered within current US borders. Have you ever seen Oklahoma and Kansas? (The Americans haden't at the time, at least not every well). In the 1810's you're promising them gold from the King of Spain's purse for anything south and west of that.
But the North is gaining the same thing but freezing taiga and swamps that no American had seen before as well. So, all in all, it is probably fair. Not sure if the Southerners would see it that way, though.
 
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